JIA Zhao,JIAN Chunxia,XIONG Peifeng,et al.Relationship Between Community Coverage and Aboveground Biomass in Farming-Withdrawn Grasslands in Loess Hilly-Gully Region[J].Research of Soil and Water Conservation,2020,27(01):319-327.
黄土丘陵区退耕草地群落盖度与地上生物量关系
- Title:
- Relationship Between Community Coverage and Aboveground Biomass in Farming-Withdrawn Grasslands in Loess Hilly-Gully Region
- 文章编号:
- 1005-3409(2020)01-0319-09
- Keywords:
- farming-withdrawn grassland; vegetation coverage; vegetation composition; aboveground biomass
- 分类号:
- Q149
- 文献标志码:
- A
- 摘要:
- 揭示黄土丘陵区退耕草地群落盖度与地上生物量的关系,对系统评价草地群落恢复潜力和水土保持效益具有重要意义。以黄土丘陵区5个退耕年限(5 a,10 a,15 a,20 a,30 a)草地群落为对象,通过照相法、群落调查和刈割法测定了草地群落盖度、物种组成和地上生物量。结果表明:群落高度、盖度与地上生物量呈显著正相关关系,与物种丰富度和Shannon-Wiener多样性指数呈显著负相关关系。群落盖度与地上生物量随退耕年限增加总体呈增加趋势,不同退耕年限草地群落间物种丰富度和多样性指数无显著差异。退耕20 a群落的植物密度、高度和单位盖度地上生物量值均最低,盖度和地上生物量与退耕15 a相比显著下降。各退耕年限草地群落优势种分别为:5 a是狗尾草(Setaria viridis)和达乌里胡枝子(Lespedeza davurica),10 a和15 a是达乌里胡枝子和铁杆蒿(Artemisia gmelinii),20 a是铁杆蒿和菊叶委陵菜(Potentilla tanacetifolia),30 a为长芒草(Stipa bungeana)。当草地群落盖度低于84.6%时,盖度与地上生物量呈极显著线性正相关关系,当盖度大于84.6%后,群落盖度不随地上生物量增加而变化。群落盖度84.6%和地上生物量285.17 g/m2可作为黄土丘陵区退耕草地植被恢复评价和调控措施的参考值。
- Abstract:
- It is of great significance to systematically evaluate the restoration potential of grassland by revealing the relationship between coverage and aboveground biomass of different farming-withdrawn grasslands in loess hilly-gully region. We selected five grassland communities with different withdrawn years(5-year, 10-year, 15-year, 20-year, 30-year)and three methods including photographic method, community survey and harvest methods were employed to obtain their coverage, species composition and biomass. The result showed that community average height had significantly positive correlation with coverage and aboveground biomass, while there is a significant negative correlation between species richness and Shannon-Wiener diversity index; Vegetation coverage and aboveground biomass increased with abandoned years, while species richness and Shannon diversity index showed no significant differences among communities; the plant density, community height and aboveground biomass per unit coverage were the lowest in the 20-year abandoned farmland, and vegetation coverage and aboveground biomass were significantly lower than those of 15-year abandoned farmland; the dominant species for different farming-withdrawn grassland communities were: Setaria viridis and Lespedeza davurica for the 5-year, L. davurica and Artemisia gmelinii for 10-year and 15-year, A. gmelinii and Potentilla tanacetifolia for 20-year and Stipa bungeana for 30-year; there was a significant positive linear correlation between vegetation coverage and aboveground biomass, when vegetation coverage was less than 84.6%, and when the vegetation coverage was greater than 84.6%, the community coverage did not change with the increase of aboveground biomass. The values of vegetation coverage(84.6%)and aboveground biomass(285.17 g/m2)can be used as important references for vegetation restoration evaluation and control measure selection in loess hilly-gully region.
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备注/Memo
收稿日期:2019-08-19 修回日期:2019-09-24
资助项目:国家自然科学基金“黄土丘陵区退耕草地群落冠层降雨截留容量特征及其量化”(41771553)
第一作者:贾昭(1993—),男,山西霍州人,硕士研究生,研究方向:水土保持效益评价。E-mail:1057600143@qq.com
通信作者:徐炳成(1973—),男,安徽肥东人,研究员,博士生导师,研究方向:草地建设与植被恢复。E-mail:Bcxu@ms.iswc.ac.cn